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Full Discussion: How to copy script output to a variable using same script?
Top Forums Shell Programming and Scripting How to copy script output to a variable using same script? Post 303008288 by Don Cragun on Wednesday 29th of November 2017 10:54:38 PM
Old 11-29-2017
We will assume that you understand that invoking script and invoking script.sh do not run the same code.

Most BSD, Linux, and UNIX systems have a utility named script installed. If you name your shell script script, whether you will invoke your shell script or the system's script utility will depend on which will be found first in the directories named by the PATH variable in your current shell execution environment.

If your script is named script and the directory containing your script is found in the PATH environment variable before the system's script utility, having the first thing that your code does be:
Code:
output=$(script)

creates a recursive sequence of invocations of your script until you exceed that number of processes you are allowed to have running with your user ID, the system runs out of available resources to create another copy of your process, or a system administrator kills your job when other users on your system complain that you are slowing down their jobs by unreasonably consuming all available system resources.
 

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LEARN ABOUT DEBIAN

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service	runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current
       working directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script.  service passes COMMAND and OPTIONS to the init script unmodified.  All scripts should support at least the start and stop
       commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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